Adjustment of uniocular telemeters



A. KUNIG. ADJUSTMENT 0F UNIOCULAR TELEMETERS.

APPLICATION FILED APR. 8 I915- RENEWED DEC. 29. 1919.

1,347,044. Patented Jul 20, 1920.

UNITED STATES PATENT OFFICE.

ALBERT KGNIG, OF JENA, GERMANY, ASSIGNOR T0 FIRIVI 0F CARL ZEISS, 0FJENA, GERMANY.

ADJUSTMENT 0F UNIOCULAR TELEMETERS.

Specifidation of Letters Patent.

Patented July 20, 1920.

Application filed April 8, 1915, Serial No. 20.063. Renewed December 29.1919, Serial No. 348.20%.

To all whom it may concern:

Be it known that I, ALBERT Konie, a citizen of the German Empire,residing at Jena, (.termany, have invented a new and useful Adjustmentof U niocular Tclemeters, of which the following is a specification.

The present invention relates to improvements in the adjustment of auniocular telemeter having the base-line within itself by employing asecond telemeter used in the reversed path of the rays with a base-lineof emergence being turned toward the entrance openings of the telemeterto be adjusted and its objectives offering images of an object ofadjustment to the objectives of the first instrument. In a well knownadjustment of this kind a stroke mark is used as an object of adjustmentthe mark being placed in the focal plane of the objectives of thetelemeter placed in front. The two part pencil systems, in which a raypencil system entering through the ocular of the telemeter placed infront is dispersed through the separating prism of this telemeter,create two ima es of the mark, each of which is conveyed to one of thetwo objective systems of the instrument to be adjusted.

According to the present invention such a stroke mark in the field ofView is dispensed with in such a way that through the ocular of thesecond telemeter any object is imaged in the focal plane of theobjectives of the latter and is offered through these objectives to thetelemeter to be adjusted. The accuracy of the adjustment is the greater,the less the mutual position of the base-lines 01" the instrumentsdeviates from that in which they are exactly parallel to each other. Inorder to facilitate such a disposition of the instruments to each othereach may be fitted with a level. The accuracy of adjustment is furtherincreased by choosing as object of adjustment a stroke mark placed insuch a position as regards the base-line that it stands vertical on thelatter. Such a disposition can be taken with advantage in such a waythat the telemeters are set up each with horizontal basis and that avertical hanging thread serves as object of adjustment.

Figure 1 of the annexed drawlng shows a side view and Fig. 2 a top viewof a device for using the invention.

A telemeter b is so placed opposite the about equal length, its openingsof telemeter a to be adjusted, that its openings of emergence of light band b are turned toward the entrance openings of light a and a of thetelemeter a. A transparent plate 0 is placed in front of the ocular I)of the second telemeter Z), having a stroke mark 0 serving as object ofadjustment. If the ocular b of the telemeter Z) is focused accordingly,an image of the mark 0 in the focal plane of the objectives of thetelemeter b is created, and each of the objectives of this telemeteroffers to one of the objectives of the telemeter a a part image of themark 0, which can then be observed through the ocular a of the telemetera.

I claim:

1. Method of adjusting a telemeter comprising an ocular, two objectivereflecting systems the distance apart of which systems forms thebase-line of the telemeter, two objective lenses each placed behindone'of the said objective reflecting systems and a separating prismsystem adapted to transmit the two ray-pencil-systems entering the saidobjective reflecting systems to the said ocular, which method consistsin imaging in the focal plane of a similar second telemeter having abase-line of about equal length any object by means of the ocular of thesaid second telemeter, placing the telemeter to be adjusted opposite thesecond telemeter in such a manner, that the rays emerging from thesecond telemeter enter the objective refleeting systems of the telemeterto be adjusted, and observing by means of the ocular of the telemeter tobe adjusted the two images, each of which is formed by one of theobjective lenses of the telemeter to be adjusted from the rays passingthrough this objective lens.

2. Method of adjusting a telemeter comprising an ocular, two objectivereflecting systems the distance apart of which systems forms thebase-line of the telemeter, two objective lenses each placed behind oneof the said objective reflecting systems and a separating prism systemadapted to transmit the two ray-pencil-systems entering the saidobjective reflecting systems to the said ocular, which method consistsin fitting on a similar second telemeter having a base-line of aboutequal length before its ocular relatively close to this second telemeterby means of a support a mark, imaging this mark in the focal plane ofthe said second telemeter by means of the ocular of the secondtelemeter, placing the telemeter to be adjusted opposite the secondtelemeter in such a manner, that the rays emerging from the secondtelemeter enter the objective reflecting systems of the telemeter to beadjusted, and observing by means of the ocular of the telemeter to beadjusted the two images,

each of which is formed by one of the ob-' jective lenses of thetelemeter to be ad- 10 'justedfrom the rays passing through thisobjective lens.

ALBERT KONIG.

Witnesses:

FRANZ RIEDINGER, RICHARD HAHN.

